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Error code reference

Bosch Dryer Error Code E:03

Maximum drying time exceeded, displayed during normal use after 240-minute limit (corresponds to E:13 in test…

Bosch codesBosch dryer codes

Maximum drying time exceeded, displayed during normal use after 240-minute limit (corresponds to E:13 in test program).

First step from the service manual

Check heater, control module, NTC's and Hi-limit's.

The complete diagnostic procedure includes additional test steps, resistance specifications, wiring diagram references, and component test points.

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  • Step-by-step tests with expected resistance, voltage, and continuity values
  • Wiring diagram references and connector pinouts from the OEM service manual
  • Verified part numbers when replacement is required
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What E:03 means on a Bosch dryer

The E:03 error code on a Bosch dryer indicates that the maximum allowable drying time of 240 minutes has been exceeded without the load reaching the target dryness level. This code appears during normal operation and corresponds to E:13 when the dryer is running in its test program mode. The control module tracks total run time and triggers this fault when a cycle cannot complete within the built-in safety limit, signaling that something is preventing the dryer from drying clothes efficiently.

The most common root cause is a heating system fault. If the heater element has failed partially or completely, the drum will tumble without generating sufficient heat, extending drying time indefinitely. High-limit thermostats and thermal cutoffs protect the machine from overheating, but if they have tripped or failed open, the heater circuit is interrupted and no heat reaches the drum. Similarly, NTC temperature sensors monitor drum and exhaust temperatures to regulate the heating cycle. A drifted or failed NTC can cause the control module to misread temperatures, cutting heat prematurely or cycling it incorrectly, which results in extended run times.

The control module itself is also a suspect when the heater, NTCs, and hi-limits all test within spec. A faulty board may fail to properly energize the heater relay, misinterpret sensor data, or fail to advance the cycle logic correctly. Diagnostic steps should begin with verifying heater continuity, then checking hi-limit and NTC resistance values against specification, and finally evaluating the control module if all other components pass inspection.

Source: manufacturer service documentation.

Common causes of E:03

  1. 01

    Failed or weak heater element

    Part replacement

    A heater element that has burned out or lost significant resistance will produce little to no heat, preventing the load from drying and causing the cycle to run until the 240-minute limit is hit. Check the element for continuity and inspect it visually for breaks.

  2. 02

    Tripped or open hi-limit thermostat

    Part replacement

    Hi-limit thermostats act as safety cutoffs and can trip permanently if the dryer has overheated, cutting power to the heater. A tripped hi-limit will show no continuity and must be replaced, but the underlying cause of overheating such as blocked airflow should also be addressed.

  3. 03

    Faulty NTC temperature sensor

    Part replacement

    NTC sensors report drum and exhaust temperatures to the control module. If an NTC has drifted out of its correct resistance range or failed entirely, the control module may cut heat too early or mismanage the heating cycle, extending run time beyond the 240-minute limit.

  4. 04

    Restricted airflow or blocked exhaust

    Wiring / connection

    A clogged lint filter, blocked exhaust duct, or obstructed venting system reduces airflow significantly, causing the dryer to take far longer to remove moisture from the load. Check and clean the lint filter, exhaust duct, and external vent before replacing any parts.

  5. 05

    Defective control module

    Part replacement

    If the heater, hi-limits, and NTCs all test within specification, the control module may be failing to properly energize the heater relay or correctly interpret sensor signals. Control module replacement is typically the last step after all other components have been ruled out.

See the test procedure for each cause

Frequently asked questions about E:03

What does E:03 mean on a Bosch dryer?
E:03 means the dryer has been running for the maximum allowed time of 240 minutes without completing the drying cycle. This fault is triggered by the control module when the load cannot reach the target dryness level within the time limit. It is the dryer's way of flagging a problem with its heating system, temperature sensing, or airflow. The same fault appears as E:13 when the dryer is operated in test program mode.
Will resetting the dryer clear the E:03 error code?
Resetting the dryer may clear the code temporarily, but the fault will return if the underlying problem is not repaired. Because E:03 indicates the dryer genuinely failed to dry within 240 minutes, simply restarting the machine without fixing the heater, sensors, or airflow will result in the same code appearing again. A proper repair is needed to resolve the condition permanently.
How do I fix the E:03 error on my Bosch dryer?
Start by cleaning the lint filter and checking that the exhaust duct is clear, since blocked airflow is a common cause that requires no parts. If airflow is fine, check the heater element for continuity, then test the hi-limit thermostats and NTC temperature sensors. Any component that fails its test should be replaced. If all components check out, the control module should be evaluated as the final possibility.
Is it safe to keep using my Bosch dryer when E:03 is displayed?
It is not advisable to continue running the dryer while E:03 is active without investigating the cause. The code indicates the dryer ran for 4 hours without finishing a cycle, which points to a heating or sensing fault that should be diagnosed. If the issue is a blocked exhaust duct or failing thermal component, continued use without repair could pose a fire risk or cause additional damage to the appliance.
How much does it cost to repair a Bosch dryer showing E:03?
Repair costs vary depending on which component has failed. Replacing an NTC sensor or hi-limit thermostat is typically the least expensive fix, often ranging from $20 to $80 in parts. A heater element replacement may cost $40 to $150 in parts depending on the model. Control module replacement is the most expensive scenario, with parts potentially ranging from $100 to $300 or more, not including labor if a technician is performing the repair.

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